Synergistic herbicidal compositions comprising 2-amino-4-aralkylamino-6-haloalkyl-1,3,5-triazines and sulfonylurea herbicides

ABSTRACT

Herbicidal compositions comprising as active ingredient a triazine derivative represented by general formula [I]: ##STR1## and suIfonylurea type herbicides represented by general formula [II]: ##STR2## By synergistic effects of active ingredients, the herbicidal compositions show a high herbicidal effect at low dosage and have such a wide range of herbicidal spectrum that the compositions exhibit their high herbicidal effect not only against broad-leaved weeds but also against Gramineae weeds, etc. The compositions have flexibility of treatment to exhibit effectiveness as compared to known herbicides for field crops and crops are free from injury.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a herbicidal composition comprising triazine derivatives and sulfonylurea type herbicides as active ingredients.

2. Statement of the Prior Art

Heretofore a variety of herbicides have been developed and have contributed to agricultural productivity and saving labors. However, some herbicides have been used over many years and hence, weeds which are insufficiently controlled are increasing. It has thus been desired to develop herbicides having a wide range of herbicidal spectrum and those effective also against such troublesome weeds. Also in order to remove environmental pollution problems caused by conventional herbicides, it has been desired to develop herbicides having a high activity at a low dosage. Moreover, in order to control weeds emerging non-uniformly over a long period of time, it has been desired to develop herbicides having an excellent residual activities and having flexibility of treatment to exhibit effectiveness even though the treatment is performed over a long period from pre-emergence to a wide range of growing stage of weeds.

Under such a situation, the present inventors found that specific, novel triazine derivatives containing a halo alkyl are compounds which show a high herbicidal effect against troublesome weeds both by soil treatment and by foliage treatment, without causing any phytotoxicities of Gramineae field crops, and moreover provide an excellent effectiveness against weeds in paddy fields (Japanese Patent Application Nos. 1-38178 and 1-154465). The present inventors made extensive investigations to further improve the herbicidal activity of the triazine derivatives.

As a result, it has been found that a composition comprising the triazine derivatives in combination with specific sulfonylurea type herbicides exhibits excellent herbicidal activity which can be unexpected from each property of these herbicides and shows a high herbicidal effect at a low dosage and at the same time, has a wide range of herbicidal spectrum. The present invention has thus been accomplished.

SUMMARY OF THE INVENTION

That is, the present invention provides a herbicidal composition comprising as active ingredients triazine derivatives represented by general formula [I]: ##STR3## (wherein Z represents oxygen atom or sulfur atom), or ##STR4## (wherein X² represents methyl group or fluorine atom and n represents 0 or an integer of 1 or 2); R¹ represents hydrogen atom or methyl group; and X¹ represents fluorine atom or chlorine atom] and sulfonylurea type herbicide represented by general formula [II]; ##STR5## (wherein X³ represents a chlorine atom, CO₂ CH₃, CO₂ C₂ H₅ or OCH₂ CH₂ Cl), ##STR6## (wherein X⁴ represents CON(CH₃)₂ or CO₂ C₂ H₅), ##STR7## R² represents a hydrogen atom or methyl group, R³ and R⁴ each represents methyl group, OCH₃ or OCHF₂, provided that R³ and R⁴ may be the same or different; Z² represents CH or a nitrogen atom, and m is 0 or 1].

DETAILED DESCRIPTION OF THE INVENTION

Specific examples of the triazine derivatives represented by general formula [I] described above include:

2-amino-4-[1-(benzofuran-2'-yl)ethylamino]-6-(α-fluoro,α-methylethyl)-s-triazine ##STR8## 2-amino-4-[1-(benzofuran-2'-yl)ethylamino]-6-(α-fluoroethyl)-s-triazine ##STR9## 2-amino-4-[1-(benzothiophen-2'-yl)ethylamino]-6-(α-fluoro,α-methylethyl)-s-triazine ##STR10## 2-amino-4-(α-fluoro, α-methylethyl)-6-[2-(3',5'-dimethylphenoxy)-1-methylethylamino]-s-triazine ##STR11## 2-amino-4-(α-fluoro,α-methylethyl)-6-[2-(3'fluorophenoxy)-1-methylethylamino]-s-triazine ##STR12## 2-amino-4-( α-chloro, α-methylethyl)-6-[2-(3',5'-dimethylphenoxy)-1-methylethylamino]-s-triazine ##STR13## 2-amino-4-( α-fluoro, α-methylethyl)-6-[2-(3',5'-dimethylphenoxy)-1-methylethylamino]-s-triazine ##STR14##

The triazine derivatives represented by general formula [I] described above may be prepared by various processes. Among these processes, an advantageous process comprises reacting alkyl amine salts represented by general formula [III]: ##STR15## [wherein A has the same significance as described above and X⁵ represents a halogen atom] with cyanoguanidine represented by the following formula ##STR16## to prepare alkyl biguanide salts represented by general formula [IV]: ##STR17## [wherein A and X⁵ have the same significances as described above]; and then reacting the alkyl biguanide salts with alkyl esters represented by general formula [V]: ##STR18## [wherein R¹ and X¹ have the same significances as described above; and R⁵ represents an alkyl group having 1 to 4 carbon atom]. According to this process, the desired triazine derivatives represented by general formula [I] can be efficiently obtained by reacting the alkylamine salts represented by general formula [III] with cyanoguanidine to prepare the alkyl biguanide salts represented by general formula [IV], and then reacting the salts [IV] with the alkyl esters represented by general formula [V].

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Herein, in the reaction of the alkylamine salts represented by general formula [III] with cyanoguanidine, both compounds may be used in equimolar amounts. As a solvents, there may be used cyclic hydrocarbons such as benzene, decaline, alkylnaphthalenes, etc.; chlorinated hydrocarbons such as carbon tetrachloride, ethylene dichloride, chlorobenzene, dichlorobenzene, trichlorobenzene, etc. A reaction temperature is not particularly limited but the reaction sufficiently proceeds at a high temperature ranging from 80° to 200° C.

According to this reaction, the alkylbiguanide derivative salts shown by general formula [IV] are obtained. By reacting [IV] with alkyl esters represented by general formula [V], the desired triazine derivatives represented by general formula [I] are prepared. This reaction efficiently proceeds generally in a solvent such as alcohols, e.g., methanol, ethanol, isopropanol, etc., various ketones, aliphatic hydrocarbons, various ethers, various cyclic hydrocarbons, chlorinated hydrocarbons, etc., in the presence of a catalyst such as a base, etc. at a temperature of about 10° to about 100° C.

Optical isomers are also present in these compounds and the products are obtained generally in the racemic form. However, it is also possible to the respective enantiomers in a conventional manner such as asymmetric synthesis, etc. In the present invention, both racemic compounds and optical isomers alone may be used. In the present invention, the products may be in the form of salts with inorganic acid or organic acid.

On the other hand, specific examples of the sulfonylurea type herbicide represented by general formula [II] described above include 2-chloro-N-[4-methoxy-6-methyl-1,3,5-triazin-2-yl)-aminocarbonyl]benzenesulfonamide, methyl 2-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)-aminocarbonyl]-aminosulfonyl]benzoate, methyl 2-[3-(4-methoxy-6-methyl-1,3,5-triazin-2-yl)-3-methylureidosulfonyl]benzoate, methyl 3-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)-aminocarbonyl]-aminosulfonyl]-2-thiophenecarboxylate, 3-(6-methoxy-4-methyl-1,3,5-triazin-2-yl)-1-[2-(2-chloroethoxy)-phenylsulfonyl]urea, methyl 2-[[(4,6-dimethyl-pyrimidin-2-yl) aminocarbonyl]-aminosulfonyl]benzoate, 2-[3-(4,6 -bis(difluoromethoxy)-pyrimidin-2-yl)-ureidosulfonyl]benzoic acid methyl ester, 2-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)-N,N-dimethylnicotinamide, 1-(4,6-dimethoxypyrimidin-2-yl)-3-(ethylsulfonyl)-2-pyridinylsulfonyl)urea, methyl 2-[[[(4,6-dimethoxypyrimidin-2-yl)aminocarbonyl]-aminosulfonyl]methyl]benzoate, ethyl 5-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)-1-methylpyrazol-4-carboxylate, etc. Among them, preferred are methyl 2-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)-aminocarbonyl]-aminosulfonyl]benzoate, methyl 3-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)-aminocarbonyl]-aminosulfonyl]-2-thiophenecarboxylate, 3-(6-methoxy-4-methyl-1,3,5-triazin-2-yl)-1-[2-(2-chloroethoxy)-phenylsulfonyl]urea, 2-[3-(4,6-bis(difluoromethoxy)-pyrimidin-2-yl)-ureidosulfonyl]benzoic acid methyl ester, 2-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)-N,N-dimethylnicotinamide, 1-(4,6-dimethoxypyrimidin-2-yl)-3-(ethylsulfonyl)-2-pyridinylsulfonyl)urea, methyl 2-[[[(4,6-dimethoxypyrimidin-2-yl)aminocarbonyl]-aminosulfonyl]methyl]benzoate, and ethyl 5-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)-1-methylpyrazol-4-carboxylate.

Among the sulfonylurea type herbicides represented by general formula [II] described above, 2-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)-N,N-dimethylnicotinamide and 1-(4,6-dimethoxypyrimidin-2-yl)-3-(ethylsulfonyl)-2-pyridinylsulfonyl)urea can be prepared by the processes described in Japanese Patent Application Laid-Open No. 62-178588 and Japanese National Patent Application Laid-Open No. 2-500912, respectively. The other sulfonylurea type herbicides can be obtained by known processes. These sulfonylurea type herbicides have a wide spectrum for broad-leaved weeds or Gramineae weeds and are used for Gramineae crops such as wheat, barley, corn, sorghum, paddy rice plant, etc.

The herbicidal composition of the present invention comprises as active ingredients the triazine derivatives represented by general formula [I] described above and the sulfonylurea type herbicides represented by general formula [II] described above. A proportion of these components to be formulated is not particularly limited but in a wide range of proportion, an excellent synergistic effect can be obtained. In general, it is preferred to formulate the triazine derivative and the sulfonylurea type herbicide in a range of from 1000:1 to 1:100 (weight ratio).

The herbicidal composition of the present invention may be used in the form of wettable powders, emulsifiable concentrates, dusts, granules, flowable concentrates, solutions, etc., by blending the triazine derivatives represented by general formula [I] described above and the sulfonylurea type herbicides represented by general formula [II] described above with liquid carriers such as solvents, etc. or with solid carriers such as mineral powders, etc. In preparing into these forms, there may be added surfactants such as emulsifiers, dispersing agents, developers, suspending agents, permeating agents, stabilizers, etc. and, if necessary, other auxiliary agents.

Where the herbicidal composition of the present invention is used in the form of wettable powders, 10 to 55 wt % of the aforesaid triazine derivatives and the sulfonylurea type herbicide as active ingredients, 40 to 88 wt % of the solid carrier and 2 to 5 wt % of the surfactant may generally be formulated to prepare a composition and the composition may be used. Where the herbicidal composition is used in the form of emulsifiable concentrate or flowable concentrate, 5 to 50 wt % of the aforesaid triazine derivatives and the sulfonylurea type herbicide as active ingredients, 35 to 90 wt % of the solvent and 5 to 15 wt % of the surfactant and other auxiliary agent may generally be formulated to prepare a composition and the resulting composition may be used.

Where herbicidal composition is used in the form of dust, 1 to 15 wt % of the aforesaid triazine derivatives and the sulfonylurea type herbicide as active ingredients and 85 to 99 wt % of the solid carrier may generally be formulated to prepare a composition. Where the herbicidal composition of the present invention is used in the form of granules, 0.1 to 15 wt % of the aforesaid triazine derivatives and the sulfonylurea type herbicide as active ingredients, 80 to 97.9 wt % of the solid carrier and 2 to 5 wt % of the surfactant may generally be formulated to prepare a composition. Herein, as the solid carrier, finely divided mineral powders are used. As the finely divided mineral powders, there are diatomaceous earth, oxides such as slaked lime, etc.; phosphates such as apatite, etc.; sulfates such as gypsum, etc.; silicates such as talc, pyrophyllite, clay, kaolin, bentonite, acid clay, white carbon, quartz powders, silica powders, etc.

As the liquid carrier, there may be organic solvents, for example, paraffin type or naphthene type hydrocarbons such as kerosene, mineral oil, spindle oil, etc.; aromatic hydrocarbons such as benzene, toluene, xylene, etc.; chlorinated hydrocarbons such as o-chlorotoluene, trichloromethane, trichloroethylene, etc.; alcohols such as cyclohexanol, amyl alcohol, ethylene glycol, etc.; alcohol ethers such as ethylene glycol monomethyl ether, ethylenen glycol monoethyl ether, etc.; ketones such as isophorone, cyclohexanone, cyclohexenyl-cyclohexanone, etc.; ethers such as butyl cellosolve, dimethyl ether, methyl ethyl ether, etc.; esters such as isopropyl acetate, benzyl acetate, methyl phthalate, etc.; amides such as dimethylformamide, etc.; nitriles such as acetonitrile, propionitrile, etc.; sulfoxides such as dimethylsulfoxide, etc.; or a mixture thereof; or water and the like.

As the surfactant, there may be used any of anion type (alkylbenzene sulfonate, alkyl sulfonates, laurinamide sulfonate, etc.), nonion type (polyoxyethylene octyl ether, polyethylene glycol laurate, sorbitan alkyl esters, etc.), cation type (dimethyllaurylbenzyl ammonium chloride, laurylamine, stearyltrimethyl ammonium chloride, etc.) and amphoteric type (amino acids, betaine, etc.).

For purposes of improving properties of the preparation and enhancing the herbicidal effect, the herbicidal composition of the present invention may also contain high molecular compounds such as sodium alginate, carboxymethyl cellulose, carboxyvinyl polymer, gum arabic, hydroxypropylmethyl cellulose, etc. and auxiliary agents in combination.

The herbicidal composition of the present invention exhibits an excellent effect on weeds in field crops such as corn, sorghum, wheat, barley, oat, etc., as a high degree of selective herbicide without causing any phytotoxicities to crops by pre-or post-emergence treatment to the soil or the foliage of weeds. The herbicidal composition shows a high herbicidal effect not only against annual weeds but also against perennial weeds and is extremely useful as a high degree of selective, herbicide without causing any phytotoxicities for paddy rice plants or lawns.

The herbicidal composition of the present invention also exhibits an excellent effect of controlling weeds in orchards or non-cultivated fields (factory areas, railways, roadsides, waterways, fallow grounds), etc., by treatment to the soil or to the foliage of weeds.

The herbicidal composition of the present invention is applied in an amount of about 0.1 to 2,000 g, preferably 1 to 200 g, per 10 ares. Where the composition is sprayed over the foliage of plant, the composition is diluted to about 1 to about 20,000 ppm, preferably 10 to 2,000 ppm and the diluted preparation is applied to the foliage.

The herbicidal composition of the present invention may also be used in combination with other herbicids. Examples of the conventional herbicids which can be used herein include diphenyl ether compounds, triazine compounds, phenoxyacetic acid compounds, carbamate compounds, thiolcarbamate compounds, acid anilide compounds, pyrazole compounds, phosphoric acid compounds, imidazolinone compounds, dinitroaniline compounds, bromoxinyl, ioxinyl, oxadiazone, etc.

Furthermore, the herbicidal composition of the present invention may also be used as admixture with insecticides, sterilizers, plant growth regulators, fertilizers, etc., if necessary.

Next, the present invention is described with reference to examples.

Firstly, a method for making formulations is specifically described by referring to formulation examples. In the following formulation examples, "part" refers to % by weight. As the triazine derivative (Compound A) and the sulfonylurea type herbicide (Compound B) compounds shown in Tables 1 and 2 were used, respectively.

                                      TABLE 1                                      __________________________________________________________________________     Compound No.                                                                           Structural Formula       Name of Compound                              __________________________________________________________________________     A-1                                                                                     ##STR19##               2-amino-4-[1-(benzofuran- 2'-yl)ethylamin                                      o]-6-(α- fluoro,                                                         α-methylethyl)- s-triazine              A-2                                                                                     ##STR20##               2-amino-4-[1-(benzofuran- 2'-yl)ethylamin                                      o]-6(α- fluoroethyl)-s-triazine         A-3                                                                                     ##STR21##               2-amino-4-[1-(benzothio- phen-2'-yl)ethyl                                      amino]-6- (α-fluoro,α-methyle                                      thyl)- s-triazine                             A-4                                                                                     ##STR22##               2-amino-4-[α-fluoro,α-                                             methylethyl-6-(2-3',5'- dimethylphenoxy)-                                      1- methylethylamino]-s- triazine              A-5                                                                                     ##STR23##               2-amino-4-(α-fluoro,α-                                             methylethyl)-6-[2-(3'- fluorophenoxy)-1-m                                      ethyl- ethylamino]-s-triazine                 A-6                                                                                     ##STR24##               2-amino-4-(α-chloro,α-                                             methylethyl)-6-[2-(3',5'- dimethylphenoxy                                      )-1- methylethylamino]-s- triazine            A-7                                                                                     ##STR25##               2-amino-4-(α-fluoro,α-                                             methylethyl)-6-[2-(3',5'- dimethylphenoxy                                      )-1- methylethylamino]-s- triazine            __________________________________________________________________________

                                      TABLE 2                                      __________________________________________________________________________     Compound No.                                                                           Structural Formula     Name of Compound                                __________________________________________________________________________     B-1                                                                                     ##STR26##             methyl2-[[(4-methoxy- 6-methyl-1.3.5-triazi                                    ne-  2-yl)aminocarbonyl]- aminosulfonyl]ben                                    zoate                                           B-2                                                                                     ##STR27##             methyl3-[[(4-methoxy- 6-methyl-1.3.5-triazi                                    ne-  2-yl)aminocarbonyl]- aminosulfonyl]-2-                                     thiophenecarboxylate                           B-3                                                                                     ##STR28##             3-(6-methoxy-4-methyl- 1.3.5-triazine-2-yl-                                    1-  [2-(2-chloroethoxy)- phenylsulfonyl]-ur                                    ea                                              B-4                                                                                     ##STR29##             2-[3-(4.6-bis(difluoro- methoxy)-pyrimidin-                                    2-yl)- ureidosulfonyl]benzoic acid methyl                                      ester                                           B-5                                                                                     ##STR30##             2-(4.6-dimethoxypyrimidin- 2-ylcarbamoylsul                                    famoyl)- N.N-dimethylnicotinamide               B-6                                                                                     ##STR31##             1-(4.6-dimethoxypyrimidin- 2-yl)-3-(ethylsu                                    lfonyl)- 2-pyridinylsulfonyl)urea               B-7                                                                                     ##STR32##             methyl2-[[[(4.6-dimethoxy- pyrimidin-2-yl)a                                    mino- carbonyl]-aminosulfonyl]- methyl]benz                                    oate                                            B-8                                                                                     ##STR33##             ethyl5-(4.6-dimethoxy- pyrimidin-2-                                            ylcarbamoylsulfamoyl)- 1-methylpyrazol-4-                                      carboxylate                                     __________________________________________________________________________

    ______________________________________                                         Formulation Example 1  Wettable powders                                        ______________________________________                                         Compound A-1             5      parts                                          Compound B-1             15     parts                                          Diatomaceous earth       62     parts                                          White carbon             15     parts                                          Sodium alkylbenzenesulfonate                                                                            2      parts                                          Sodium lignin sulfonate  1      part                                           ______________________________________                                    

The foregoing components are blended with each other, uniformly kneaded and ground into powders to give 100 parts of wettable powders.

    ______________________________________                                         Formulation Example 2  Emulsifiable concentrate                                ______________________________________                                         Compound A-2             10     parts                                          Compound B-2             30     parts                                          Xylene                   20     parts                                          Dimethylformamide        20     parts                                          Solpol 2806B (manufactured by                                                                           20     parts                                          Toho Chemical Industry, surfactant)                                            ______________________________________                                    

The foregoing components are uniformly dissolved and blended to give 100 parts of emulsifiable concentrate.

    ______________________________________                                         Formulation Example 3  Dust                                                    ______________________________________                                         Compound A-3             0.6    part                                           Compound B-6             1.4    parts                                          Diatomaceous earth       20     parts                                          Talc                     78     parts                                          ______________________________________                                    

The foregoing components are blended with each other, uniformly kneaded and ground to give 100 parts of dusts.

    ______________________________________                                         Formulation Example 4  Granule                                                 ______________________________________                                         Compound A-5             1      part                                           Compound B-7             3      parts                                          Bentonite                30     parts                                          Talc                     63     parts                                          Sodium lignin sulfonate  3      parts                                          ______________________________________                                    

The foregoing components are thoroughly blended with each other, uniformly mixed and ground into powders. Water is added to the powders. After kneading them well, the blend is grained and dried to give 100 parts of granules.

    ______________________________________                                         Formulation Example 5  Flowable concentrate                                    ______________________________________                                         Compound A-7             10     parts                                          Compound B-4             15     parts                                          Methyl cellulose         0.3    part                                           Colloidal silica         1.5    parts                                          Sodium lignin sulfonate  1      part                                           Polyoxyethylene nonyl phenyl ether                                                                      2      parts                                          Water                    70.2   parts                                          ______________________________________                                    

The foregoing components are thoroughly mixed and dispersed. The resulting slurry mixture is subjected to wet grinding to give 100 parts of stable flowable concentrate.

FORMULATION EXAMPLE 6 Wettable Powders

By uniformly blending 97 parts of clay (trademark: JIKURAITO, manufactured by JIKURAITO KOGYO) as a carrier, 1.5 parts of alkylaryl sulfonate (trademark: NEOPELEX, manufactured by Kao Atlas Co., Ltd.) as a surfactant, 1.5 parts of nonionic and anionic surfactant (trademark: Solpol 800A, manufactured by Toho Chemical Industry Co., Ltd.) and grinding into powders, a carrier for wettable powders was obtained.

By uniformly blending 90 parts of this carrier for wettable powders and 10 parts of the triazine derivative shown in Table 1 (Compounds A-1 through A-7) or 10 parts of the sulfonylurea type herbicide shown in Table 2 (Compounds B-1 to B-8) and grinding into powders, wettable powders were obtained.

Furthermore, the carrier for wettable powders containing the triazine derivative obtained above was blended with the carrier for wettable powders containing the sulfonylurea type herbicide in definite amounts (ratios as active ingredients), uniformly kneaded and ground into powders to give wettable powders.

EXAMPLE 1 Test on Post-emergence Treatment

Wagner's pots of 1/2000 ares were filled with soil from upland fields and planted with weed seeds of Galium aparine L., Velonica hedelifolia and Viola arvensis and crop seeds of wheat, barley and oat. The seeds were then covered with soil and cultivated in a greenhouse. An aqueous suspension of a definite amount of the herbicide obtained in Formulation Example 6 was uniformly sprayed onto the foliage of 1.5 to 2.5 leaf stage of these weeds and 3 leaf stage of the crops at a spray volume corresponding to 100 liters/10 ares. Then, cultivation was performed in the greenhouse. After 20 days, crop injury and the herbicidal effect on the weeds were evaluated according to the criterion described below. The results are shown in Table 3.

    ______________________________________                                         (Criterion for assessment)                                                                      Percent of weed control                                       Degree of herbicidal effect                                                                     (herbicidal rate)                                             ______________________________________                                         0                less than 5%                                                                   (little effective)                                            1                 5-20%                                                        2                20-40%                                                        3                40-70%                                                        4                70-80%                                                        5                more than 90%                                                                  (almost all killed)                                           ______________________________________                                    

The herbicidal rate described above was determined according to the following equation by measuring the raw weight of weed on the ground in the treated group and the raw weight of weed on the ground in the untreated group. ##EQU1##

Degree of Crop Injury

0 . . . no injury to crops

1 . . . little injury to crops

2 . . . some injury to crops

3 . . . injury to crops

4 . . . serious injury to crops

5 . . . almost all crops are withered to death

                                      TABLE 3                                      __________________________________________________________________________                    Herbicidal Effect                                               Active     Dosage                                                                             Galium                                                                               Veronica                                                                             Viola                                                                              Crop Injury                                     ingredient (g/10a)                                                                            aparine L.                                                                           hedelifolia                                                                          arvensis                                                                           Wheat                                                                              Barley                                                                             Sorghum                                 __________________________________________________________________________     Triazine                                                                               A-1                                                                               10  2     3     3   0   0   0                                       Derivative 5   1     2     2   0   0   0                                               A-2                                                                               10  3     4     4   0   0   0                                                  5   2     2     3   0   0   0                                               A-3                                                                               10  3     3     3   0   0   0                                                  5   1     2     2   0   0   0                                               A-4                                                                               10  3     3     4   0   0   0                                                  5   1     2     2   0   0   0                                               A-5                                                                               10  3     4     4   0   0   0                                                  5   2     3     3   0   0   0                                               A-6                                                                               10  3     3     4   0   0   0                                                  5   1     2     2   0   0   0                                               A-7                                                                               10  4     4     4   0   0   0                                                  5   2     2     3   0   0   0                                       Sulfonylurea                                                                           B-1                                                                               0.6 2     3     2   0   0   0                                       Type Herbicide                                                                            0.3 1     2     1   0   0   0                                               B-2                                                                               4   2     2     3   0   0   0                                                  2   1     1     2   0   0   0                                               B-3                                                                               1   3     3     3   0   0   0                                                  0.5 2     1     2   0   0   0                                       __________________________________________________________________________     Triazine                                                                              Sulfonylurea                                                            Derivative                                                                            Type Herbicide                                                                         Herbicidal Effect                                               Dosage     Dosage                                                                             Galium                                                                               Veronica                                                                             Viola                                                                              Crop Injury                                     Kind                                                                              (g/10a)                                                                            Kind                                                                               (g/10a)                                                                            aparine L.                                                                           hedelifolia                                                                          arvensis                                                                           Wheat                                                                              Barley                                                                             Sorghum                                 __________________________________________________________________________     A-1                                                                               10  B-1 0.6 5     5     5   0   0   0                                          10      0.3 5     5     5   0   0   0                                           5      0.6 5     5     5   0   0   0                                           5      0.3 5     5     5   0   0   0                                       A-2                                                                               10  B-1 0.6 5     5     5   0   0   0                                          10      0.3 5     5     5   0   0   0                                           5      0.6 5     5     5   0   0   0                                           5      0.3 5     5     5   0   0   0                                       A-2                                                                               10  B-2 4   5     5     5   0   0   0                                          10      2   5     5     5   0   0   0                                           5      4   5     5     5   0   0   0                                           5      2   5     5     5   0   0   0                                       A-2                                                                               10  B-3 1   5     5     5   0   0   0                                          10      0.5 5     5     5   0   0   0                                           5      1   5     5     5   0   0   0                                           5      0.5 5     5     5   0   0   0                                       A-3                                                                               10  B-2 4   5     5     5   0   0   0                                          10      2                                                                       5      4   5     5     5   0   0   0                                           5      2   5     5     5   0   0   0                                       A-4                                                                               10  B-3 1   5     5     5   0   0   0                                          10      0.5 5     5     5   0   0   0                                           5      1   5     5     5   0   0   0                                           5      0.5 5     5     5   0   0   0                                       A-5                                                                               10  B-1 0.6 5     5     5   0   0   0                                          10      0.3 5     5     5   0   0   0                                           5      0.6 5     5     5   0   0   0                                          `5      0.3 5     5     5   0   0   0                                       A-5                                                                               10  B-2 4   5     5     5   0   0   0                                          10      2   5     5     5   0   0   0                                           5      4   5     5     5   0   0   0                                           5      2   5     5     5   0   0   0                                       A-5                                                                               10  B-3 1   5     5     5   0   0   0                                          10      0.5 5     5     5   0   0   0                                           5      1   5     5     5   0   0   0                                           5      0.5 5     5     5   0   0   0                                       A-6                                                                               10  B-2 4   5     5     5   0   0   0                                          10      2   5     5     5   0   0   0                                           5      4   5     5     5   0   0   0                                           5      2   5     5     5   0   0   0                                       A-7                                                                               10  B-1 0.6 5     5     5   0   0   0                                          10      0.3 5     5     5   0   0   0                                           5      0.6 5     5     5   0   0   0                                           5      0.3 5     5     5   0   0   0                                       A-7                                                                               10  B-2 4   5     5     5   0   0   0                                          10      2   5     5     5   0   0   0                                           5      4   5     5     5   0   0   0                                           5      2   5     5     5   0   0   0                                       A-7                                                                               10  B-3 1   5     5     5   0   0   0                                          10      0.5 5     5     5   0   0   0                                           5      1   5     5     5   0   0   0                                           5      0.5 5     5     5   0   0   0                                       __________________________________________________________________________

Some data were extracted from the results shown in Table 3 and the synergistic effect of the triazine derivative and the sulfonylurea type herbicide was examined on Galium aparine L., and Viola arvensis according to the following method. ##EQU2## Q a: found data (%) of herbicidal rate when treated at a dosage corresponding to a g/10 ares using the triazine derivative alone as active ingredient

Q b: found data (%) of herbicidal rate when treated at a dosage corresponding to b g/10 ares using the sulfonylurea derivative alone as active ingredient

Q E: expected value

[Limpel, L. E , P. H. Schuldt and D. Lamont, Proc. NEWCC, 16, 48-53 (1962)]

Herein, when the found data (herbicidal rate) of the herbicidal obtained by mixing the triazine derivative and the sulfonylurea type herbicide is larger than Q E, it can be said that the herbicidal activity is synergistic. The results are shown in Table 4.

                                      TABLE 4                                      __________________________________________________________________________     Triazine                                                                              Sulfonylurea Type                                                                        Herbicidal Effect                                             Derivative                                                                            Herbicide Percent control                                                                        Expected                                                                            Percent Control                                                                        Expected                                    Dosage   Dosage                                                                              of Galium                                                                              Value                                                                               of Viola                                                                               Value                                    Kind                                                                              (g/10a)                                                                            Kind (g/10a)                                                                             aparine L. (%)                                                                         (Q.sub.E) (%)                                                                       arvensis (%)                                                                           (Q.sub.E) (%)                            __________________________________________________________________________     -- --  B-1  0.6  38      --   37      --                                       -- --  B-2  4    36      --   48      --                                       -- --  B-3  1    52      --   54      --                                       A-1                                                                               10  --   --   39      --   48      --                                       A-1                                                                               10  B-1  0.6  94      62   97      67                                       A-2                                                                               5   --   --   38      --   64      --                                       A-2                                                                               5   B-1  0.6  95      62   98      77                                       A-2                                                                               5   --   --   38      --   64      --                                       A-2                                                                               5   B-2  0.4  94      60   98      81                                       A-2                                                                               5   --   --   38      --   64      --                                       A-2                                                                               5   B-3  0.1  96      70   98      83                                       A-3                                                                               10  --   --   54      --   56      --                                       A-3                                                                               10  B-2  4    94      71   97      77                                       A-4                                                                               10  --   --   58      --   70      --                                       A-4                                                                               10  B-3  1    98      80   100     86                                       A-5                                                                               5   --   --   36      --   68      --                                       A-5                                                                               5   B-1  0.6  96      60   99      80                                       A-5                                                                               5   --   --   36      --   68      --                                       A-5                                                                               5   B-2  4    95      59   100     83                                       A-5                                                                               5   --   --   36      --   68      --                                       A-5                                                                               5   B-3  1    97      69   100     85                                       A-6                                                                               10  --   --   62      --   72      --                                       A-6                                                                               10  B-2  4    99      76   100     85                                       A-7                                                                               5   --   --   40      --   58      --                                       A-7                                                                               5   B-1  0.6  98      63   97      74                                       A-7                                                                               5   --   --   40      --   58      --                                       A-7                                                                               5   B-2  4    96      62   98      78                                       A-7                                                                               5   --   --   40      --   58      --                                       A-7                                                                               5   B-3  1    97      71   99      81                                       __________________________________________________________________________

EXAMPLE 2 Test on Post-emergence Treatment

Wagner's pots of 1/2000 ares were filled with soil from upland fields and planted with weed seeds of Digitaria sanguinalis, Abutilon theophrasti and Ipomoea purpurea and crop seeds of corn and sorghum. The seeds were then covered with soil and cultivated in a greenhouse. An aqueous suspension of a definite amount of the herbicide obtained in Formulation Example 6 was uniformly sprayed onto the foliage of 2 to 3 leaf stage of these weeds and 3 leaf stage of the crops at a spray volume corresponding to 100 liters/10 ares. Then, cultivation was performed in the greenhouse. After 20 days, crop injury and the herbicidal effect on the weeds were evaluated according to the same criterion described in Example 1. The results are shown in Table 5.

                                      TABLE 5                                      __________________________________________________________________________                      Herbicidal Effect                                             Active      Dosage                                                                              Digitaria                                                                            Abutilon                                                                             Ipomoea                                                                             Crop Injury                                  ingredient  (g/10a)                                                                             sanguinalis                                                                          theophrasti                                                                          purpurea                                                                            Corn                                                                              Sorghum                                   __________________________________________________________________________     Triazine                                                                               A-1 10   3     3     4    0  0                                         Derivative  5    1     1     2    0  0                                                 A-2 10   3     4     4    0  0                                                     5    2     2     2    0  0                                                 A-3 10   2     3     4    0  0                                                     5    1     2     2    0  0                                                 A-4 10   2     3     4    0  0                                                     5    1     2     3    0  0                                                 A-5 10   3     4     5    0  0                                                     5    2     3     4    0  0                                                 A-6 10   3     3     5    0  0                                                     5    1     2     3    0  0                                                 A-7 10   3     4     5    0  0                                                     5    2     3     4    0  0                                         Sulfonylurea                                                                           B-4 1    4     2     2    0  0                                         Type Herbicide                                                                             0.5  3     1     1    0  0                                                 B-5 0.6  4     3     2    0  0                                                     0.3  2     2     1    0  0                                                 B-6 4    3     2     3    0  0                                                     2    2     1     2    0  0                                         __________________________________________________________________________     Triazine                                                                              Sulfonylurea                                                            Derivative                                                                            Type Herbicide                                                                           Herbicidal Effect                                             Dosage      Dosage                                                                              Digitaria                                                                            Abutilon                                                                             Ipomoea                                                                             Crop Injury                                  Kind                                                                              (g/10a)                                                                            Kind (g/10a)                                                                             sanguinalis                                                                          theophrasti                                                                          purpurea                                                                            Corn                                                                              Sorghum                                   __________________________________________________________________________     A-1                                                                               10  B-4  1    5     5     5    0  0                                            10       0.5  5     5     5    0  0                                             5       1    5     5     5    0  0                                             5       0.5  5     5     5    0  0                                         A-2                                                                               10  B-4  1    5     5     5    0  0                                            10       0.5  5     5     5    0  0                                             5       1    5     5     5    0  0                                             5       0.5  5     5     5    0  0                                         A-2                                                                               10  B-5  0.6  5     5     5    0  0                                            10       0.3  5     5     5    0  0                                             5       0.6  5     5     5    0  0                                             5       0.3  5     5     5    0  0                                         A-2                                                                               10  B-6  4    5     5     5    0  0                                            10       2    5     5     5    0  0                                             5       4    5     5     5    0  0                                             5       2    5     5     5    0  0                                         A-3                                                                               10  B-5  0.6  5     5     5    0  0                                            10       0.3  5     5     5    0  0                                             5       0.6  5     5     5    0  0                                             5       0.3  5     5     5    0  0                                         A-4                                                                               10  B-6  4    5     5     5    0  0                                            10       2    5     5     5    0  0                                             5       4    5     5     5    0  0                                             5       2    5     5     5    0  0                                         A-5                                                                               10  B-4  1    5     5     5    0  0                                            10       0.5  5     5     5    0  0                                             5       1    5     5     5    0  0                                             5       0.5  5     5     5    0  0                                         A-5                                                                               10  B-5  0.6  5     5     5    0  0                                            10       0.3  5     5     5    0  0                                             5       0.6  5     5     5    0  0                                             5       0.3  5     5     5    0  0                                         A-5                                                                               10  B-6  4    5     5     5    0  0                                            10       2    5     5     5    0  0                                             5       4    5     5     5    0  0                                             5       2    5     5     5    0  0                                         A-6                                                                               10  B-5  0.6  5     5     5    0  0                                            10       0.3  5     5     5    0  0                                             5       0.6  5     5     5    0  0                                             5       0.3  5     5     5    0  0                                         A-7                                                                               10  B-4  1    5     5     5    0  0                                            10       0.5  5     5     5    0  0                                             5       1    5     5     5    0  0                                             5       0.5  5     5     5    0  0                                         A-7                                                                               10  B-5  0.6  5     5     5    0  0                                            10       0.3  5     5     5    0  0                                             5       0.6  5     5     5    0  0                                             5       0.3  5     5     5    0  0                                         A-7                                                                               10  B-6  4    5     5     5    0  0                                            10       2    5     5     5    0  0                                             5       4    5     5     5    0  0                                             5       2    5     5     5    0  0                                         __________________________________________________________________________

EXAMPLE 3 Paddy Field Test (Post-emergence Treatment Test)

Pots of 1/2000 are were filled with soil from paddy fields and seeded with seeds from Echinochloa crus-galli, Then, water was filled to a depth of 3 cm.

Thereafter when Echinochloa crus-galli reached the 1.5-leaf stage, a definite amount of a dilution of the herbicide obtained in Formulation Example 6 was dropped on the water surface. Then, the weeds were allowed to stand in a greenhouse. Twenty days after the treatment, the herbicidal effect on the weeds evaluated according to the criterion of Example 1. The results are shown in Table 6.

                  TABLE 6                                                          ______________________________________                                         Active          Dosage  Herbicidal Effect for                                  ingredient      (g/10a) Echinochloa crus-galli                                 ______________________________________                                         Triazine   A-1      10      4                                                  Derivative          5       2                                                             A-2      10      4                                                                      5       2                                                             A-3      10      3                                                                      5       2                                                             A-4      10      2                                                                      5       2                                                             A-5      10      4                                                                      5       3                                                             A-6      10      3                                                                      5       2                                                             A-7      10      4                                                                      5       3                                                  Sulfonylurea                                                                              B-7      4       2                                                  Type                2       1                                                  Herbicide  B-8      1       3                                                                      0.5     2                                                  ______________________________________                                         Triazine Sulfonylurea                                                          Derivative                                                                              Type Herbicide                                                             Dosage            Dosage Herbicidal Effect for                            Kind (g/10a) Kind      (g/10a)                                                                               Echinochloa crus-galli                           ______________________________________                                         A-1  10      B-7       4      5                                                     10                2      5                                                      5                4      5                                                      5                2      5                                                A-1  10      B-8       1      5                                                     10                0.5    5                                                      5                1      5                                                      5                0.5    5                                                A-2  10      B-7       4      5                                                     10                2      5                                                      5                4      5                                                      5                2      5                                                A-2  10      B-8       1      5                                                     10                0.5    5                                                      5                1      5                                                      5                0.5    5                                                A-3  10      B-7       4      5                                                     10                2      5                                                      5                4      5                                                      5                2      5                                                A-3  10      B-8       1      5                                                     10                0.5    5                                                      5                1      5                                                      5                0.5    5                                                A-4  10      B-7       4      5                                                     10                2      5                                                      5                4      5                                                      5                2      5                                                A-4  10      B-8       1      5                                                     10                0.5    5                                                      5                1      5                                                      5                0.5    5                                                A-5  10      B-7       4      5                                                     10                2      5                                                      5                4      5                                                      5                2      5                                                A-5  10      B-8       1      5                                                     10                0.5    5                                                      5                1      5                                                      5                0.5    5                                                A-6  10      B-7       4      5                                                     10                2      5                                                      5                4      5                                                      5                2      5                                                A-6  10      B-8       1      5                                                     10                0.5    5                                                      5                1      5                                                      5                0.5    5                                                A-7  10      B-7       4      5                                                     10                2      5                                                      5                4      5                                                      5                2      5                                                A-7  10      B-8       1      5                                                     10                0.5    5                                                      5                1      5                                                      5                0.5    5                                                ______________________________________                                    

EXAMPLE 4 Field Test (Pre-emergence Treatment Test)

Test zone having each plot of 2 m² were prepared and weed seeds of Galium aparine L., Stellaria media, Viola arvensis, Matricaria inodora., Veronica hedelifolia, Papaver rhoeas and Aphanes arvensis and crop seeds of wheat and barley were simultaneously planted.

At the pre-emergence timing of wheat, barley and weeds, a given amount of a dilution of the herbicide obtained in Formulation Example 6 was uniformly sprayed over the soil surface at a spray volume corresponding to 20 liters/10 ares. The test was carried out by 3 replications.

The weeds on the ground which survived 60 days after spraying of the chemical were cut out and their raw weight were measured. According to the following equation, a weed controlling rate was determined as an average of the 3 replicates. ##EQU3##

With respect to wheat and barley, their raw weights on the ground were measured also as in weeds and the degree of crop injury (inhibition rate) was determined. The results are shown in Table 7.

                                      TABLE 7                                      __________________________________________________________________________     Active ingredient                                                                             A-2 + B-1                                                                            A-2 + B-1                                                                            A-7 + B-1                                                                            A-7 + B-1                                     Dosage (g/10a) 20 + 0.6                                                                             10 + 0.6                                                                             20 + 0.6                                                                             10 + 0.6                                      __________________________________________________________________________     Percent of Weed Control (%)                                                    Galium aparine L.                                                                             100   100   100   100                                           Stellaria media                                                                               100   100   100   100                                           Viola arvensis 100   100   100   100                                           Matricaria inodora                                                                            100   100   100   100                                           Veronica hedelifolia                                                                          100   100   100   100                                           Papaver rhoeas 100   100   100   100                                           Aphanes arvensis                                                                              100   100   100   100                                           Crop Injury                                                                    Wheat           0     0     0     0                                            Barley          0     0     0     0                                            __________________________________________________________________________

EXAMPLE 5 Field Test (Post-emergence Treatment Test)

Test zones having each plot of 2 m² were prepared and weed seeds of Galium aparine L., Stellaria media, Viola arvensis, Matricaria inodora, Veronica hedelifolia, Papaver rhoeas and Aphanes arvensis and crop seeds of wheat and barley were simultaneously planted.

When weeds grew at the 2-3 leaf stage and wheat and barley reached the 3-leaf stage, a given amount of a dilution of the herbicide obtained in Formulation Example 6 was uniformly sprayed onto the foliage at a spray volume corresponding to 20 liters/10 ares.

The percent of weed control and the degree of crop injury were determined 30 days after spraying the chemical in a manner similar to Example 4. The results are shown in Table 8.

                                      TABLE 8                                      __________________________________________________________________________     Active ingredient                                                                        A-2 + B-1                                                                            A-2 + B-1                                                                            A-7 + B-1                                                                            A-7 + B-1                                                                            A-2 + B-2                                                                            A-2 + B-2                                                                            A-7 + B-2                                                                            A-7 + B-2                  Dosage (g/10a)                                                                           20 + 0.6                                                                             10 + 0.6                                                                             20 + 0.6                                                                             10 + 0.6                                                                             20 + 4                                                                               10 + 4                                                                               20 + 4                                                                               10 + 4                     __________________________________________________________________________     Percent of Weed                                                                Control (%)                                                                    Galium aparine L.                                                                        100   100   100   100   100   100   100   100                        Stellaria media                                                                          100   100   100   100   100   100   100   100                        Viola arvensis                                                                           100   100   100   100   100   100   100   100                        Matricaria inodora                                                                       100   100   100   100   100   100   100   100                        Veronica hedelifolia                                                                     100   100   100   100   100   100   100   100                        Papaver rhoeas                                                                           100   100   100   100   100   100   100   100                        Aphanes arvensis                                                                         100   100   100   100   100   100   100   100                        Crop Injury                                                                    Wheat      0     0     0     0     0     0      0    0                         Barley     0     0     0     0     0     0     0     0                         __________________________________________________________________________

EXAMPLE 6 Field Test (Post-emergence Treatment Test)

Test zones having each plot of 2 m² were prepared and weed seeds of Digitaria sanguinalis, Xanthium strumarium, Ipomoea purpurea, Abutilon theophrasti. Portulaca oleracea, Solanum nigrum, Cassia obtusitolia L., and Amaranthus retroflexus and crop seeds of corn and sorghum were simultaneously planted.

When weeds grew at the 2-3 leaf stable and corn and sorghum reached the 3-leaf stage, a given amount of a dilution of the herbicide obtained in Formulation Example 6 was uniformly sprayed onto the foliage at a spray volume corresponding to 20 liters/10 ares. The percent of weed control and the degree of crop injury were determined 30 days after spraying the chemical in a manner similar to Example 4. The results are shown in Table 9.

                                      TABLE 9                                      __________________________________________________________________________     Active ingredient                                                                             A-2 + B-4                                                                            A-2 + B-4                                                                            A-7 + B-4                                                                            A-7 + B-4                                     Dosage (g/10a) 20 + 1                                                                               10 + 1                                                                               20 + 1                                                                               10 + 1                                        __________________________________________________________________________     Percent of Weed Control (%)                                                    Digitaria sanguinalis                                                                         100   100   100   100                                           Xanthium strumarium                                                                           100   100   100   100                                           Ipomoea purpurea                                                                              100   100   100   100                                           Abutilon theophrasti                                                                          100   100   100   100                                           Portulaca oleracea                                                                            100   100   100   100                                           Solanum nigrum 100   100   100   100                                           Cassia obtusifolia L.                                                                         100   100   100   100                                           Amaranthus retroflexus                                                                        100   100   100   100                                           Crop Injury                                                                    Corn            0     0     0     0                                            Sorghum         0     0     0     0                                            __________________________________________________________________________

By the synergistic effect of the triazine derivative and sulfonylurea type herbicide as active ingredients, the herbicidal composition of the present invention show a high herbicidal effect at a low dosage and also have a wide range of herbicidal spectrum. Further when the composition is used as herbicide for field crops, the composition has flexibility of treatment to exhibit effectiveness, as compared to in conventional herbicides for field crops. The composition also shows a high herbicidal activity even against troublesome weeds both by treatment to the soil at the pre- or post-emergence of weeds and by treatment to the foliage at the post-emergence of weeds. In addition, no crop injury is caused. In particular, the effect is markedly high in treatment to the soil or foliage treatment in fields where Gramineae crops grow. Further, when the present herbicide is used as a herbicide for paddy rice, it shows excellent herbicidal effect not only against annual weeds but also against perennial weeds.

While the invention has been described in detail and with reference to specific embodiments thereof, it is apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and the scope of the present invention. 

What is claimed is:
 1. A herbicidal composition comprising as an active ingredient a herbicidally effective amount of a triazine compound represented by the formula (I): ##STR34## wherein Z¹ represents oxygen atom or sulfur atom, or ##STR35## wherein X² represents methyl group or fluorine atom and n represents 0 or an integer of 1 or 2; R¹ represents hydrogen atom or methyl group; and X¹ represents fluorine atom or chlorine atom and a herbicidally effective amount of a sulfonylurea type herbicide represented by the formula (II): ##STR36## wherein X³ represents a chlorine atom, CO₂ CH₃, CO₂ C₂ H₅ or OCH₂ CH₂ Cl, ##STR37## wherein X⁴ represents CON(CH₃)₂ or CO₂ C₂ H₅, ##STR38## R² represents a hydrogen atom or methyl group, R³ and R⁴ each represents methyl group, OCH₃ or OCHF₂, provided that R³ and R⁴ may be the same or different; Z² represents CH or a nitrogen atom, and m is 0 or
 1. 2. The herbicidal composition as claimed in claim 1, wherein the triazine compound represented by general formula (I) is a triazine compound selected from the group consisting of 2-amino-4-[1-(benzofuran-2'-yl)ethylamino]-6-(α-fluoro, α-methylethyl)-s-triazine, 2-amino-4-[1-(benzofuran-2'-yl)ethylamino]-6-(α-fluoroethyl)-s-triazine, 2-amino-4-[1-(benzothiophen-2'-yl)ethylamino]-6-(α-fluoro,α-methylethyl)-s-triazine, 2-amino-4-(α-fluoro,α-methylethyl)-6-[2-(3',5'-dimethylphenoxy)-1-methylethylamino[-s-triazine, 2-amino-4-(α-fluoro,α-methylethyl)-6-[2-(3'fluorophenoxy)-1-methylethylamino]-s-triazine, 2-amino-4-(α-chloro, α-methylethyl)-6-[2-(3',5'-dimethylphenoxy)-1-methylethylamino]-s-triazine and 2-amino-4-(α-fluoro,α-methylethyl)-6-[2-(3,'5'-dimethylphenoxy)-1-methylethylamino]-s-triazine.
 3. The herbicidal composition as claimed in claim 1, wherein the sulfonylurea type herbicide represented by general formula (II) is a sulfonylurea type herbicide selected from the group consisting of 2-chloro-N-[4-methoxy-6-methyl-1,3,5-triazin-2-yl)-aminocarbonyl]benzenesulfonamide, methyl 2-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)-aminocarbonyl]aminosulfonyl]benzoate, methyl 2-[3-(4-methoxy-6-methyl-1,3,5-triazin-2-yl)-3-methylureidosulfonyl]benzoate, methyl 3-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)-aminocarbonyl]aminosulfonyl]-2-thiophenecarboxylate, 3-(6-methoxy-4-methyl-1,3,5-triazin-2-yl)-1-[2-(2-chloroethoxy)-phenylsulfonyl]urea, methyl 2-[[(4,6-dimethyl-pyrimidin-2-yl) aminocarbonyl]-aminosulfonyl]benzoate, 2-[3-(4,6-bis(difluoromethoxy)-pyrimidin-2-yl)-ureidosulfonyl]benzoic acid methyl ester, 2-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)-N,N-dimethylnicotinamide, 1-(4,6-dimethoxypyrimidin-2-yl)-3-(ethylsulfonyl)-2-pyridinylsulfonyl)urea, methyl 2-[[[(4,6-dimethoxypyrimidin-2-yl)aminocarbonyl]-aminosulfonyl]methyl]benzoate and ethyl 5-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)-1-methylpyrazol-4-carboxylate.
 4. The herbicidal composition as claimed in claim 3, wherein the triazine compound represented by the formula (I) is a triazine compound selected from the group consisting of 2-amino-4-[1-(benzofuran-2'-yl)ethylamino]-6-(α-fluoro,α-methylethyl)-s-triazine, 2-amino-4-[1-(benzofuran-2'-yl)ethylamino]-6-(α-fluoroethyl)-s-triazine, 2-amino-4-[1-(benzothiophen-2'-yl)ethylamino]6-(α-fluoro,α-methylethyl)-s-triazine, 2-amino-4-(α-fluoro,α-methylethyl)-6-[2-(3',5'-dimethylphenoxy)-1-methylethylamino]-s-triazine, 2-amino-4-(α-fluoro,α-methylethyl)-6-(2-[3'fluorophenoxy)-1-methylethylamino]-s-triazine, 2-amino-4-(α-chloro,α-methylethyl)-6-[2-(3',5'-dimethylphenoxy)-1-methylethylamino]-s-triazine and 2-amino-4-(α-fluoro,α-methylethyl)-6-[2-(3',5'-dimethylphenoxy)-1-methylethylamino]-s-triazine.
 5. The herbicidal composition as claimed in claim 4, wherein the triazine compound and the sulfonylurea type herbicide are present in a weight ratio of 1000:1 to 1:100.
 6. The herbicidal composition as claimed in claim 5, wherein the sulfonylurea type herbicide is selected from the group consisting ofmethyl-2-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)aminocarbonyl]aminosulfonyl]benzoate, methyl-3-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)aminocarbonyl]aminosulfonyl]-2-thiophenecarboxylate, 3-(6-methoxy-4-methyl-1,3,5-triazine-2-yl)-1-[2-(2-chloroethoxy)phenylsulfonyl]-urea, 2-[3-(4,6-bis(difluoromethoxy)-pyrimidin-2-yl)ureidosulfonyl]benzoic acid methyl ester, 2-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)-N,N-dimethylnicotinamide, 1-(4,6-dimethoxypyrimidin-2-yl)-3-(ethylsulfonyl)-2-pyridinylsulfonyl)urea, methyl-2-[[[(4,6-dimethoxypyrimidin-2-yl)aminocarbonyl]-aminosulfonyl]methyl]benzoate and ethyl-5-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)1-methylpyrazol-4-carboxylate
 7. The herbicidal composition as claimed in claim 5, wherein the triazine compound is 2-amino-4-[1-(benzofuran-2'-yl)ethylamino]-6-(α-fluoroethyl)-s-triazine and the sulfonylurea type herbicide is 2-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)-N,N-dimethylnicotinamide
 8. A method of combatting weeds comprising applying to weeds or to a locus thereof an effective herbicidal amount of the composition according to claim
 1. 9. The method as claimed in claim 8, wherein the triazine compound represented by the formula (I) is a triazine compound selected from the group consisting of 2-amino-4-[1-(benzofuran-2'-yl)ethylamino]-6-(α-fluoro,α-methylethyl)-s-triazine, 2-amino-4-[1-(benzofuran-2'-yl)ethylamino]-6-(α-fluoroethyl)-s-triazine, 2-amino-4-[1-(benzothiophen-2'-yl)ethylamino]-6-(α-fluoro,α-methylethyl)-s-triazine, 2-amino-4-(α-fluoro,α-methylethyl)-6-[2-(3',5'-dimethylphenoxy)-1-methylethylamino[-s-triazine, 2-amino-4-(α-fluoro,α-methylethyl)-6-[2-(3'fluorophenoxy)-1-methylethylamino]-s-triazine, 2-amino-4-(α-chloro, α-methylethyl)-6-[2-(3',5'-dimethylphenoxy)-1-methylethylamino]-s-triazine and 2-amino-4-(α-fluoro,α-methylethyl)-6-[2-(3,'5'-dimethylphenoxy)-1-methylethylamino]-s-triazine.
 10. The method as claimed in claim 8, wherein the sulfonylurea type herbicide represented by the formula (II) is a sulfonylurea type herbicide selected from the group consisting of 2-chloro-N-[4-methoxy-6-methyl-1,3,5-triazin-2-yl)-aminocarbonyl]benzenesulfonamide, methyl 2-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)-aminocarbonyl]aminosulfonyl]benzoate, methyl 2-[3-(4-methoxy-6-methyl-1,3,5-triazin-2-yl)-3-methylureidosulfonyl]benzoate, methyl 3-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)-aminocarbonyl]aminosulfonyl]-2-thiophenecarboxylate, 3-(6-methoxy-4-methyl-1,3,5-triazin-2-yl)-1-[2-(2-chloroethoxy)-phenylsulfonyl]urea, methyl 2-[[(4,6-dimethyl-pyrimidin-2-yl) aminocarbonyl]-aminosulfonyl]benzoate, 2-[3-(4,6-bis(difluoromethyoxy)-pyrimidin-2-yl)-ureidosulfonyl]benzoic acid methyl ester, 2-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)-N,N-dimethylnicotinamide, 1-(4,6-dimethoxypyrimidin-2-yl)-3-(ethylsulfonyl)-2-pyridinylsulfonyl)urea, methyl 2-[[[(4,6-dimethoxypyrimidin-2-yl)aminocarbonyl]-aminosulfonyl]methyl]benzoate and ethyl 5-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)-1-methylpyrazol-4-carboxylate.
 11. The method as claimed in claim 10 wherein the triazine compound represented by the formula (I) is a triazine compound selected from the group consisting of 2-amino-4-[1-(benzofuran-2'-yl)ethylamino]-6-(α-fluoro,α-methylethyl)-s-triazine, 2-amino-4-[1-(benzofuran-2'-yl)ethylamino]-6-(α-fluoroethyl)-s-triazine, 2-amino-4-[1-(benzothiophen-2'-yl)ethylamino]-6-(α-fluoro,α-methylethyl)-s-triazine, 2-amino-4-(α-fluoro,α-methylethyl)-6-[2-(3',5'-dimethylphenoxy)-1-methylethylamino]-s-triazine, 2-amino-4-(α-fluoro,α-methylethyl)-6-[2-(3'fluorophenoxy)-1-methylethylamino]-s-triazine, 2-amino-4-(α-chloro, α-methylethyl)-6-[2-(3',5'-dimethylphenoxy)-1-methylethylamino]-s-triazine and 2-amino-4-(α-fluoro,α-methylethyl)-6-[2-(3,'5'-dimethylphenoxy)-1-methylethylamino]-s-triazine.
 12. The method as claimed in claim 11, wherein the triazine compound and the sulfonylurea type herbicide are present in a weight ratio of 1000:1 to 1:100.
 13. The method as claimed in claim 12, wherein the sulfonylurea type herbicide is selected from the group consisting ofmethyl-2-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)aminocarbonyl]aminosulfonyl]benzoate, methyl-3-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)aminocarbonyl]aminosulfonyl]-2-thiophenecarboxylate, 3-(6-methoxy-4-methyl-1,3,5-triazine-2-yl)-1-[2-(2-chloroethoxy)phenylsulfonyl]-urea, 2-[3-(4,6-bis(difluoromethoxy)-pyrimidin-2-yl)ureidosulfonyl]benzoic acid methyl ester, 2-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)-N,N-dimethylnicotinamide, 1-(4,6-dimethoxypyrimidin-2-yl)-3-(ethylsulfonyl)-2-pyridinylsulfonyl)urea, methyl-2-[[[(4,6-dimethoxypyrimidin-2-yl)aminocarbonyl]-aminosulfonyl]methyl]benzoate and ethyl-5-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)1-methylpyrazol-4-carboxylate
 14. The method as claimed in claim 12, wherein the triazine compound is 2-amino-4-[1-(benzofuran-2'-yl)ethylamino]-6-(α-fluoroethyl)-s-triazine and the sulfonylurea type herbicide is 2-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)-N,N-dimethylnicotinamide. 